Great malboro has insane DEF/SPR and the only way to reliably damage it is to trigger Skin Softened by killing both malboro adds and have it resummon them on the same turn. Once it triggers Skin Softened, you can damage it for 2 turns before having to repeat the cycle. Use AoE damage to kill adds at the same time.

Malboro will summon Great Malboro back with full health when it dies. To win the battle you will need to kill Great Malboro and Malboro adds on the same turn.

What you'll need:

Good tank to absorb Tentacles Blow and normal attacks. Since Tentacles Blow decreases your DEF, you will need to go an extra mile in gearing their DEF and HP, or use an anti-break ability with Tilith.

Healer with anti-paralysis to resist Paralyzing Touch, as it targets the highest SPR unit. While provoke will work against enemy's highest stats targetting, camouflage will not.

Cure or resistance to all ailments to block Bad Breath. Ilias and Marie (awakened ability) can provide resistance while cure is available to more units, including Rikku's TMR, Rikku's Pouch. Your ailments healer will need to resist all bad ailments for them to be effective.

Dark resistance to resist Acidic Spew from all Malboro adds.

Dispel for Crazy Mad. Dispel should also be used for Berserk Touch. Prepare your highest ATK unit to be berserked every 3 turns below 50% HP threshold. You may use tank to provoke this.

If Great Malboro is killed first, upon resummon he will attempt to Proliferation and this will trigger "No allies around". This enables you two turns to get Great Malboro back down to reasonable HP along with Malboro adds to try and clear before Great Malboro begins triggering his rotation again.

Your dealers should be able to deal at least 10% (11% is stable) HP damage to 'both' malboros. If not, malboro will kill your party with Acidic Explosion and great malboro will make new 100% malboro again.

Malboro A and B should be killed in 20 turns, otherwise they will not generate lb crystals. The counter resets when they are re-summoned.

The aim is to deal large swaths of damage that kill all 3 units at the same time, while minimizing the amount of turns spent under the 50% HP threshold.

The tricky part is that the damage is heavily dependent on RNG, and that all three need to be alive to maintain the damage. This is particularly tricky since Setzer will have limited remaining equipment slots for protective gear after gearing for status immunity.

A WoL, Wilhelm, or Veritas of the Earth with 70% Evasion, or combining this with Rikku cheese can make this easier.

It would help to do more damage against Great Malboro, so that it will have close to 4 million HP on the turn you defeat the two adds. That way, when the two adds are revived, all three targets will have almost the same amount of HP, making it easier to defeat all three targets at the same time using Setzer's Double Dice.

1 slot can be used for 2nd tank or supporter. If you use 2nd tank, don't provoke until 1st tank got devoured.

Strategy

From the first turn, all DPSers and healers use defend, your tanker uses Provoke, and Rikku uses synthesis.

After this, DPSers attack with their AOE chaining skill (Pod 153 with Demon or Plant Killer is best because it makes stable damage), Rikku maintain Hyper NulAll.

Get both Malboros' HP to 11% and kill them both at the same time so that you can attack Great Malboro more easily.

Repeat this till you make Great Malboro's HP 1-2% (so that you can kill it with AOE without debuff)

Reduce both Malboros' HP to 11%~10% again and finish them with AOE. Use a Limit Burst.

When the Great Malboro uses devour and if your dealers can tank without tanker, keep doing works, if not, defend. Malboro will Devour your tanker if Provoke is up. If you have 2nd tanker in party, 2nd tanker use provoke to protect your party. Rikku uses her limit at this point. Also, if you can, blinding the small malboros will help you.

Great Malboro will not use Devour and Bad Breath if you kill both Malboros at every 4 turns when Great Malboro's HP is over 50%. Instead, Great Malboro uses Proliferation only. From below 50%, killing both malboro at every 3 turns will make the same thing happen. This can skip Berserk Touch also.

No need 4 ignorance. Hp 5k-6k recommended. Ribbon Required. Use as my LB boost equips as possible while making sure she has the HIGHEST SPR in the party (to be targeted once per turn and protect your Tilith). 9S tm optional.

Tilith

Make sure she can refresh 99-100 mp per turn. 4.5k hp is ok (5k is safe). Ribbon Required.

Now Malboro Badbreah devour every 3 turns. So adjust the 3 turns mechanics above accordingly. USE DICE on Main body until it reaches 1% (400k hp).

Now that we have 1% / 10% / 10% hp on Main and Minies. Hope for the Best that your Setzer can deal 200k x 2 dmg (Double Dice) 20% chance. Legitimately you won't need to re-login if it occurs right away. The choice is up to you whether to exploit the reset method to deal the last blow on ALL MALBOROS.

Lunera sang song and she has Toxic Rain, so she can take part in elemental chaining with Fohlen and Randi.

Rikku has Prodigy's Goggles and two Ignorance, so she can use LB for every 3 turns, i take turns Synthesis, Hyper NulAll, LB.

Wilhelm is set for evasion 65%. Therefore he can evade many normal attacks, he can survive well.

Randi and Fohlen did only dealing.

Marie used awaken Love You All. It puts up a dark resistance and everyone get 10000HP over five turns. This is why i do not need any healer. And she also has Toxic Rain, she take part in elemental chaining with Fohlen and Randi and Lunera

Every devour turns, turn off the game. Then, the Great Marlboro do not use devour, Bad Breath, Berserk Touch, etc

Final timing, i made Great Marlboro's HP below 19998, and small Marlboros' Hp below 10%. And i used Lunera's LB and Rikku's Sunburst, Randi's Swinging Slash, Fohlen's Vortex, Marie's Toxic Rain and killed all of them.

Dark Veritas Strategy (Clear All Missions)

3x Dark Veritas, Tilith, Ace, Wilhelm,

Requirements

For this strategy to be successful you need a minimum of 2x Dark Veritas, Tilith, Ace, Wilhelm, and a 3rd Dark Veritas preferably, but not necessary.You can also use Orlandeau, 2b, or 2a

Best in slot - Dark Veritas (Luneth, Orlandeau, 2b, or 2a will work, but must have over 5k hp)

Setup : It is MANDATORY that this slot have Excalibur as well for chaining, and Pod 153.

Strategy

How it works

The reason Dark Veritas is so valuable in this fight, is his ability to absorb dark damage. The adds' do AOE Dark damage every turn. Your DPS units are the most vulnerable because they have damage mods in ability and equipment slots. Dark Veritas is actually healed from these attacks!! No problem! Additionally, Tillith will have high amounts of spirit, Ace has dark resist from his esper, and Wilhelm has tons of HP and mitigation, with Abyss Guard (70% Dark Resist) via Dark Veritas, Ace and Tillith will take virtually no damage,with mechanical heart TM they may even be full hp after every round, and Wilhelm will be nice and comfy with 3-4k HP after each round.

After turn 1 Tillith will exclusively use Radiant Light unless a party member dies

Ace will exclusively use Tri-beam Laser and Spirit Hand

Support Dark Veritas will keep Abyss Guard up at all times and use Impact to keep debuff up. They will overlap and you can easily summon Ifrit during one of those turns. He will aslo be used for DPS, but most needed after Skin Softened. It is important that you watch the turn count and make sure Abyss Guard and Imapct are fresh, this way he will be able to use Mirage instead of a buff or debuff for those two turns.

DPS is going to spam mirage, get the adds' to 20% HP and debuffed fully to safely finish them off. You may die, especially if you forget to cast an, Impregnable, or Abyss Guard.

If you have Orlandeau in stead of Dark Veritas and he dies, it is best to leave him dead so that you can keep Wilhelm alive, his aggro is too important. Once you can use Wilhelm's limit burst safely, revive with Tillith, use Limit burst, Repair, P Shield, and you will survive.

If Wilhelm dies, obviously you must revive. Use Abyss Guard to buff him, and the other Dark Vertas to Repair, Other DPS uses P Shield. Hope Wilhelm's 50% Draw Attacks trait kicks in here, because he will not have Impregnable up.

If Tillith Dies, Give Up!

You are not going to be killing the adds' in 4 Turns, 5 turns is likely the earliest turn kill them safely, without reducing them under the 10% threshold. So don't push it, you will log out every 4th turn(above 50%HP), and 3rd turn(under 50%HP) anyway!

After Skin Softened is triggered, 3x Mirage and Tri-Beam Laser will do 5-6% of his HP. If you only have access to 2x Mirage it should still do 3% of his HP and is fine.

After 50% HP Marlboro will use Crazy Mad. Wilhelm must use his limit burst if you are going to survive with no deaths. Generals Command can be used a couple turns ahead if planned well, for extra mitigation.

Once Great Marlboro is under 10% you have 4 turns of 99% debuff.

The adds are going to be around 80%+ So, 2-3x Mirage depending on your buff/debuff rotation. Adjust how you chain, based on your DPS, you do not want to bring the adds' below 55% on this turn.

Next turn, Dark Punishment x2(40% HP w/ a perfect chain and 950dps), or Corresponding skill (Divine Ruination, Speed, Dash Attack) on first add'. Make sure you refresh you debuffs.

Repeat on the other add'

We can kill it this turn, as all debuffs should be up. 3x Mirage, Ace will get the last hit with his limit burst, Tilith and Wilhelm are open.

Increase your spell stacking damage to cap. You can combine this with the stacking damage transfer method above.

Cast reflectga, target your own party member, and then cast the spell.

Note: Reflect stacks. If you have Carbuncle and Marie you can stack them to multiple layers.

Word of caution: Marie has the counterattack Punishment, which can hit individual Malboros with a random elemental debuff. This can cause one to die before the other, which will throw off your sequence. Be mindful of this; or make sure they're already debuffed for your element of choice using her Anti-Element.

Both great malboro and malboro are not immune to charm which can be used by soleil limit.

Great Marlboro won't use devour if malboros are killed on turns when it should be cast - multiples of 4 while he's above 50%, multiples of 3 below.

The smaller Malboros use Sclerosis (50% element resist self) at times and this will make it hard to kill both at the same time (to prevent Proliferation or Acidic Explosion) with elemental damages. You will need to use dispelga, Sealed Light (Tilith), Bushido Freedom, dual cast dispel etc.

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